Electrical winding



Feb. 14, E950 G. H. PHELPS ELECTRICAL WINDING Filed April 22, 1944 hmmm mm i I) nlllll-llllll INVENTOR ATTORNEY Patented Feb. 14, 1950 ELECTRICAL WINDING George H. Phelps, Floral Park, N. Y., assignor to Metropolitan Engineering Company, Brooklyn, N. Y., a corporation of New York Application April 22, 1944, Serial No. 532,295

2 Claims.

The invention herein disclosed relates to an electrically conductive winding that is particularly suitable for carrying very heavy currents.

In certain instances, electrical windings are required to carry very heavy currents. It is essential that the heat generated be dissipated rapidly to avoid injury to the winding. An example of such a winding is the primary of a transformer for a welder of the kind in which the weld is effected by the electric resistance method. In such machines, the metal pieces to be welded are heated by the passage of a very heavy electric current through the pieces. This heavy electric current is supplied from a transformer, and unless some provision be made for dissipating the heat generated in the winding of the transformer, the transformer has a relatively short life.

, By thisinvention there is provided an electrically conductive winding in which the heat is extracted by a cooling fluid flowing through the winding. In accordance with the invention, the coil comprises a wound conductor which essentially includes three parts or elements. Two of the elements are electrically conductive solid copper elements of like cross section. Each of these elements has a substantially semi-cylindrical groove or depression therein running longitudinally thereof. The third element consists of a tube, preferably a metallic, copper tube situated between the solid electrically conductive elements in heat transfer relation therewith. .The tube is adapted for carrying a cooling fluid and suitable connections are provided for delivering the fluid at one end of the tube and discharging the fluid from the other end of the tube.

A winding embodying this invention is illustrated in the accompanying drawing as an example of one specific embodiment and it is described in detail below from which description a clearer understanding of the invention may be had.

The drawings include:

Fig. 1 which is an isometric view of a winding embodying the invention; and

Fig. 2 which is a fragmentary, transverse section of the same taken on the line 22 of Fig. 1.

The winding illustrated in the drawing consists of two coils I and 2, one within the other with an air space therebetween. At one end, the coils are electrically connected together by a conmotor 3. At the other end of the winding, the end 4 of the inner coil is connected to a line terminal 5, and the end 8 of the coil 2 is connected to a line terminal I.

Each coil comprises a pair of conductors. The outer coil includes the conductors 8 and 9, and the inner coil consists of the conductors II and I i. The several conductors are identical in construction and the two coils, except for the size, are likewise identical in construction. The conductor 8 includes two copper elements I2 and I3 which are of like cross sections. These elements are preferably rolled to shape. The element I2 is rectangular in cross section and has a substantially semi-cylindrical groove or depression I4 in one face thereof running longitudinally thereof from end to end. The element I3 is likewise rectangular in cross-section and has a substantially semi-cylindrical depression I 5 in one face thereof, the face opposite to the one of the element I3 having the depression I4 therein. Between the elements and within the depressions M and I5, there is a 001 1 81 tube [6. This tube extends through the entire conductor and beyond the ends thereof.

As illustrated in the drawings, the depressions I 4 and I5 in the conductors I2 and I3 are, in cross-section, arcs of circles. The radius of these depressions is the same as the radius of the outside diameter of the tube I'B. However, the depressions are, in cross-section, less than a semi-circle so that when the assembly is drawn together the adjacent faces of the elements I2 and I3 do not meet and an intimate surface contact is effected between theelements and the tube which provides a good heat transfer relation. On being bent, in winding the coil, this intimate contact is maintained as even with the deformation of the tube in bending the conductor as at H, the adjacent faces of the elements I2 and I3 just about come together at the bend.

Between the conductors 8 and 9 which make up the coil 2, there is placed a fiat fibre strip I8. With this strip between the conductors, insulation I9 is wound, tightly, about the conductors. The insulation serves to insulate the conductors and to secure the elements of the conductors together as well as securing the two conductors together. So constructed, the two conductors 8 and 9 constitute the coil 2, and the conductors Ill and I5 which are identical in construction, constitute the coil I.

The tube I6 of the conductor 8 has an end section 20 extending beyond one end of the conductor. A like end section 22, of the tube 23 of the conductor'fl extends from the corresponding end of the conductor 9. These end sections of the tubes are connected to a manifold 24. Like end sections 25 and 26 of the tubes in the conductors l9 and M respectively are also connected to the manifold 29. The manifold is supplied with water through an inlet connection 21 which is connected with a water supply through a rubber tube.

At the opposite end of the winding 2, end sections 28 and 29 of the tubes I6 and 23 respec tively extend beyond the conductors 8 and 9 and beyond the line terminal 1. These end sections are connected to a discharge manifold 30 to which there is also connected a water outlet tube 3| that is preferably connected to a drain by a rubber tube. Like end sections 31 and 32 of the'tubes within the conductors l0 and II extend beyond.

the conductors and the line terminal 5. These end sections are connected to a discharge manifold 33. This manifold is separated from the manifold 30 and it has a separate water outlet tube 35 that is connected to the drain through a rubber tube.

From the foregoing description of the embodiment of the invention disclosed in the drawing, it will be seen that by this invention there is provided a winding and coil that is suitable for carying heavy currents; that is cooled by a fluid flowing therethrough in intimate heat transfer relation with the conductor; that is constructed such that it is readily assembled; sturdy, reliable in function, and suitable for long service.

It will be obvious that various changes may be made by those skilled in the art in the details of the embodiment of the invention illustrated in the drawings and described in detail above within the principle and scope of the invention as expressed in the appended claims.

I claim:

1. An electrically conductive coil for carrying a heavy current which coil comprises a pair of superimposed wound conductors, each conductor conductor comprising a pair of conducting elements, each element having a substantially semicylindrical depression therein running longitudinally thereof and a copper tube between the eleincluding a pair of conducting elements, each element having a substantially semi-cylindrical depression therein running longitudinally thereof .ments an'd'extending beyond the ends thereof, an

insulating strip between the superimposed con ductors, insulating material surrounding the superimposed conductors, a manifold at one end of the winding for distributing a cooling fluid to all of the copper tubes; and a pair of discharge manifolds at the other end, one for each pair of superimposed conductors.

GEORGE H. PHELPS.

. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 617,067 Williams -1 Jan. 3, 1899 665,573 Moody et a1. Jan. 8, 1901 1,105,385 Troy ".Q July 28, 1914 1,242,649 Brand Oct. 29, 1917 1,394,044 Stephens Oct. 18, 1921 7 1,449,206 Weed Mar. 20, 1923 1,471,096 Brand Oct. 16, 1923 1,588,512 Austin June 15, 1926 2,170,700 Von Henke Aug. 22, 1939 2,255,657 Freedman Sept. 9, 1941 Strickland Aug. 3, 1943 

